I had so many from just eating chips as a kid in Mexico. They still make em, my ex brought me a couple dragon ball super ones from when she went on vacation to Mexico to cheat on me.
I still don’t even know where they came from or why they existed but I did have a big tube of them and a nice brass slammer. Clearly I needed to fit in with my older brothers and that’s basically all I know about them.
They came from Hawaii, milk bottles or containers of some kind had the cardboard circle under the cap, and kid's made up this game with them at the breakfast table
Interesting. I was speaking more to my personal collection than anything else—Guess it’s time to go down the rabbit hole of Pog history haha. Surprised they haven’t resurfaced as an app (unless they have, I haven’t checked).